Expands the inline comment to serve as a reference for when to use the
COALESCE(NULLIF(?, zero), column) defensive idiom in JSONL imports.
Pattern protects clone-local state (pinned, gate fields) from being
overwritten when importing JSONL where omitempty causes zero values to
represent "field absent" rather than "field is zero".
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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